Portuguese Grammar Reference ("QuickGrammar")
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>>Portuguese Nouns > Regular Nouns > Number
Every noun in Portuguese has a singular form and a plural form. This property of the noun is often called its number. Singular nouns represent only one instance of the noun, while plural nouns refer to two or more without specifying an exact number.
Portuguese nouns have a variety of possible endings in the singular, some of them clearly marking the noun's gender. Whatever the noun's ending, it will always take an -s in the plural, like the majority of nouns in English.
Nouns ending in a vowel in the singular add an -s to that vowel to form the plural. Ano year has the plural form anos years. The word festa feast has the plural form festas feasts.
Nouns ending in a consonant in the singular add an -es to that consonant in the plural. The word voz voice has the plural vozes voices.
Nouns with the ending -l and -s or -ã, -ão and -m are exceptions to these rules.
The articles must match the number of the noun. You can learn more about this topic in using articles with the noun. Portuguese adjectives also change to reflect the number of the noun.